Reaktion #1062401

Reaktionsgleichung

2,2,2-trifluoro-1-(4-trifluoromethylphenyl)ethanol

sodium hypochlorite

water

→

4-Trifluoroacetyltrifluoromethylbenzene

Lösungsmittel

methylene chloride

Reaktionsbedingungen

Aufarbeitung

1. 1
   Sonstigeare metered in within 20 minutes
2. 2
   workup.STIRRINGthe mixture is stirred for a further 5 hours at room temperature
3. 3
   Sonstigethe phases are separated
4. 4
   Extraktionthe aqueous phase is extracted several times with methylene chloride
5. 5
   Waschenthe combined organic phases are washed with saturated aqueous sodium chloride solution
6. 6
   TrocknenAfter drying the organic phase with sodium sulfate
7. 7
   workup.DISTILLATIONthe volatiles are distilled off
8. 8
   workup.DISTILLATIONdistillation of the crude product (18 torr, 60°-61° C.), 16.74 g (66.5% of theory) of 4-trifluoroacetyltrifluoromethylbenzene
9. 9
   Sonstigeare obtained

Vorschrift

25.4 g (0.1 mol) of 2,2,2-trifluoro-1-(4-trifluoromethylphenyl)ethanol and 1.76 g (0.005 mol) of tetrabutylammonium hydrogen sulfate are dissolved in 350 ml of methylene chloride at room temperature. 108 ml (0.125 mol) of an approximately 12% strength sodium hypochlorite solution are metered in within 20 minutes with vigorous stirring and the mixture is stirred for a further 5 hours at room temperature. The reaction mixture is added to 400 ml of water, the phases are separated, the aqueous phase is extracted several times with methylene chloride and the combined organic phases are washed with saturated aqueous sodium chloride solution. After drying the organic phase with sodium sulfate, the volatiles are distilled off. Following distillation of the crude product (18 torr, 60°-61° C.), 16.74 g (66.5% of theory) of 4-trifluoroacetyltrifluoromethylbenzene are obtained, which, according to GC, is 96.7% pure. nD20 : 1.4146.

Quelle